问题 从包含的usercontrol为窗口内的某些控件设置样式

您可能无法使用获取资源 self.Resources['disabledStyle'] （通常在控件层次结构中定义样式时执行此操作）。它可以给你null，可能不会注意到它。

尝试

MyControl.Style = DirectCast(FindResource("labelStyle2"), Style)

FindResource（） 如果找不到所请求的资源，将会给你错误。

嗨，请尝试下一个：

XAML

<Window x:Class="ListViewWithCanvasPanel.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:listViewWithCanvasPanel="clr-namespace:ListViewWithCanvasPanel"
    Title="MainWindow" Height="350" Width="525" x:Name="This" ResizeMode="CanResize" 
    listViewWithCanvasPanel:Attached.AreChildrenEnabled = "true"><!--put your content here--></Window>

附加属性代码

public class Attached
{
    public static readonly DependencyProperty AreChildrenEnabledProperty = DependencyProperty.RegisterAttached("AreChildrenEnabled", typeof (bool), typeof (Attached), new PropertyMetadata(default(bool), AreChildrenEnabledPropertyChangedCallback));

    private static void AreChildrenEnabledPropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
    {
        var val = (bool) args.NewValue;
        if (val == false)
        {
            var visual = dependencyObject as FrameworkElement;
            if (visual == null) return;
            visual.Loaded -= VisualOnLoaded;
            visual.Unloaded -= VisualOnUnloaded;
        }
        else
        {
            var visual = dependencyObject as FrameworkElement;
            if(visual == null) return;
            visual.Loaded += VisualOnLoaded;
            visual.Unloaded += VisualOnUnloaded;
        }
    }

    private static void VisualOnUnloaded(object sender, RoutedEventArgs e)
    {
        var visual = sender as FrameworkElement;
        if (visual == null) return;
        visual.Loaded -= VisualOnLoaded;
    }

    private static void VisualOnLoaded(object sender, RoutedEventArgs routedEventArgs)
    {
        var visual = sender as FrameworkElement;
        if (visual == null) return;
        var list = visual.GetAllVisualChildren();
        Debug.WriteLine("children count on loading: {0}", list.Count);
        var actionOnChildrenLoading = GetActionOnEachLoadedVisualChild(visual);
        if(actionOnChildrenLoading == null) return;
        list.ForEach(o =>
        {
            var combo = o as ComboBox;
            if (combo != null)
            {
                combo.IsEnabled = false;
            }

            var button = o as Button;
            if (button != null)
            {
                button.IsEnabled = false;
            }

            var textBlock = o as TextBlock;
            if (textBlock != null)
            {
                textBlock.IsEnabled = false;
            }

            var cb = o as CheckBox;
            if (cb != null)
            {
                cb.IsEnabled = false;
            }

            var textBox = o as TextBox;
            if (textBox == null) return;
            textBox.IsEnabled = true;
            textBox.IsReadOnly = true;
        });
    }

    public static readonly DependencyProperty ActionOnEachLoadedVisualChildProperty = DependencyProperty.RegisterAttached(
        "ActionOnEachLoadedVisualChild", typeof (Action<DependencyObject>), typeof (Attached), new PropertyMetadata(default(Action<DependencyObject>)));

    public static void SetActionOnEachLoadedVisualChild(DependencyObject element, Action<DependencyObject> value)
    {
        element.SetValue(ActionOnEachLoadedVisualChildProperty, value);
    }

    public static Action<DependencyObject> GetActionOnEachLoadedVisualChild(DependencyObject element)
    {
        return (Action<DependencyObject>) element.GetValue(ActionOnEachLoadedVisualChildProperty);
    }

    public static bool GetAreChildrenEnabled(UIElement element)
    {
        return (bool) element.GetValue(AreChildrenEnabledProperty);
    }

    public static void SetAreChildrenEnabled(UIElement element, bool value)
    {
        element.SetValue(AreChildrenEnabledProperty, value);
    }
}

助手代码

public static class VisualTreeHelperExtensions
{
    public static T FindParent<T>(this DependencyObject child) where T : DependencyObject
    {
        while (true)
        {
            //get parent item
            DependencyObject parentObject = VisualTreeHelper.GetParent(child);

            //we've reached the end of the tree
            if (parentObject == null) return null;

            //check if the parent matches the type we're looking for
            T parent = parentObject as T;
            if (parent != null)
                return parent;
            child = parentObject;
        }
    }

    public static List<DependencyObject> GetAllVisualChildren(this DependencyObject parent)
    {
        var resultedList = new List<DependencyObject>();
        var visualQueue = new Queue<DependencyObject>();
        visualQueue.Enqueue(parent);

        do
        {
            var depObj = visualQueue.Dequeue();
            var childrenCount = VisualTreeHelper.GetChildrenCount(depObj);

            for (int i = 0; i < childrenCount; i++)
            {
                var v = VisualTreeHelper.GetChild(depObj, i);
                visualQueue.Enqueue(v);
            }

            resultedList.Add(depObj);
        } while (visualQueue.Count > 0);

        resultedList.RemoveAt(0);
        return resultedList;
    }

}

**简短说明：*

查找根的所有可视子项（例如窗口），扫描它们并根据子类型执行操作。

问候，

尝试这个，
1.添加一个布尔属性，将CanUserEdit添加到usercontrol，后者控制可以在其他控件中编辑的内容。
2.在其他用户控件中添加datatrigger并绑定到CanUserEdit（2个数据触发器，1个用于组合框，另一个用于文本框）。

在其中定义没有key的UserControl标签。这将影响该usercontrol中存在的所有文本框和组合框。
您还将获得集中控制。

示例代码： -
在每个userControl中添加CanUserEdit依赖项属性。

        //Replace MainUserControl with your control name
 public static readonly DependencyProperty CanUserEditProperty =
 DependencyProperty.Register("CanUserEdit", typeof(bool),
 typeof(MainUserControl));

    public bool CanUserEdit
    {
        get { return (bool)GetValue(CanUserEditProperty); }
        set { SetValue(CanUserEditProperty, value); }
    }

在包含文本框和组合框的UserControl中，您可以将以下代码添加到UserControl.Resources

<UserControl.Resources>
    <Style TargetType="TextBox">
        <Setter Property="IsReadOnly" Value="False"/>
        <Style.Triggers>
            <DataTrigger Binding="{Binding CanUserEdit}" Value="false">
                <Setter Property="IsReadOnly" Value="True"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>
    <Style TargetType="ComboBox">
        <Setter Property="IsEnabled" Value="True"/>
        <Style.Triggers>
            <DataTrigger Binding="{Binding CanUserEdit}" Value="false">
                <Setter Property="IsEnabled" Value="False"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>
</UserControl.Resources>

这将影响该控件中的所有组合框和文本框。

在主窗口中，您将每个UserControl的CanUserEdit属性绑定到UserControl的CanUserEdit属性，该属性具有编辑控制权。
示例（MainUserControl是具有文本框和组合框的控件）：

<local:MainUserControl  CanUserEdit="{Binding CanUserEdit,ElementName=CanUserEditControl}"  />

现在，您所要做的就是切换UserControl的CanUserEdit属性，该属性控制编辑并且所有控件都会受到影响。

我让它以一种不那么优雅的方式工作，迭代所有控件并自己设置属性。在这样做的同时，我保存了关于我更改了哪些控件的信息，以便能够将UI重置为原始状态。我对此并不满意，但似乎有效。我本来希望设置和取消设置一些风格，但我没有办法这样做。

这是我最终使用的内容，但随意发布更好的内容。首先是禁用部分：

visited = set()

def disableControls(control):
    visited.add(control)

    for childNumber in xrange(VisualTreeHelper.GetChildrenCount(control)):
        child = VisualTreeHelper.GetChild(control, childNumber)

        # save the old state
        if type(child) in [Button, ComboBox, CheckBox] and child.IsEnabled:
            child.IsEnabled = False
            self.disabledControls.add(child)
        elif type(child) == TextBox and not child.IsReadOnly:
            child.IsReadOnly = True
            self.disabledControls.add(child)
        elif child not in visited:
            disableControls(child)
disableControls(self.windowOwner)

以下是将UI“重置”为原始状态的部分：

while self.disabledControls:
    child = self.disabledControls.pop()
    if type(child) in [Button, ComboBox, CheckBox]:
        child.IsEnabled = True
    elif type(child) == TextBox:
        child.IsReadOnly = False

该 visited-set只是一个局部变量，可以避免多次访问控件，这种情况很奇怪，例如对于一些网格。该 disabledControls-set保存所有未禁用的控件，因此已被代码禁用，并且必须在UI将其自身重置为原始状态时重置。

实现此方案的一种简单方法可以是通过发布者订阅者实现。通过绑定/将该属性分配给目标控件，可以轻松地将属性状态发布到其他用户控件并设置控件状态。 我通过MvvmLight Messenger实现了类似的场景，我甚至根据一些内部控制状态禁用了一些Ribbon命令。